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PSRR of folded cascode opamp

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sneha rayala

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Can someone please explain how PSRR of folded cascode opamp is calculated with detail analysis . More intuitively if possible .
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Connect differential inputs with DC source, no ac signal. Add ac=1 at VDD source. Now you are injecting ac noise at VDD. Run AC analysis from 1 to say 1GHz. Plot opamp Vout. This will tell you how is the Vdd noise attenuation at the Vout. More the negative value, the better is PSRR. Hope this helps.
 
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